﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WinnerCMS.Common
{
    public class ConvertHelper
    {
        public static object ChangeType(object value, Type type)
        {
            if (value == null && type.IsGenericType)
                return Activator.CreateInstance(type);
            if (type == typeof (Guid))
                return new Guid(value as string);

            if (type == typeof (bool))
                return Convert.ToBoolean(value);


            if (value == null)
                return null;
            if (type == value.GetType())
                return value;
            if (type.IsEnum)
            {
                if (value is string)
                    return Enum.Parse(type, value as string);
                else
                    return Enum.ToObject(type, value);
            }
            if (!type.IsInterface && type.IsGenericType)
            {
                Type innerType = type.GetGenericArguments()[0];
                object innerValue = ChangeType(value, innerType);
                return Activator.CreateInstance(type, new object[] {innerValue});
            }

            if (!(value is IConvertible))
                return value;
            return Convert.ChangeType(value, type);
        }
    }
}